Failed to stop jenkins.service: Unit jenkins.service not loaded.

如果您执行 `sudo systemctl stop jenkins` 命令时出现 "Failed to stop jenkins.service: Unit jenkins.service not loaded." 的错误提示，说明 jenkins 服务并未被正确安装或已经被卸载。您可以尝试使用以下命令检查 jenkins 服务是否存在：

systemctl list-unit-files | grep jenkins

如果 jenkins 服务存在，则会显示 `jenkins.service`；如果不存在，则不会有任何输出。

如果 jenkins 服务已经被卸载，您可以跳过停止 jenkins 服务的步骤，直接执行后续的卸载步骤。如果 jenkins 服务仍然存在但无法停止，您可以尝试使用 `kill` 命令强制结束 jenkins 进程，然后再执行卸载操作。

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linux系统Failed to stop jenkins.service: Unit jenkins.service not loaded.

如果执行 `sudo systemctl stop jenkins` 命令时出现 "Failed to stop jenkins.service: Unit jenkins.service not loaded." 的错误提示，可能有以下原因：

1. Jenkins 服务未安装：如果您在安装 Jenkins 服务之前执行了 `systemctl stop jenkins` 命令，会出现此错误提示。请确保 Jenkins 服务已正确安装并在运行。

2. Jenkins 服务已被卸载：如果 Jenkins 服务已被卸载，那么该服务单元将不存在于系统中。您可以通过运行 `systemctl list-unit-files | grep jenkins` 命令来检查 Jenkins 服务是否存在。

3. Jenkins 服务已被重命名：如果 Jenkins 服务已被重命名为其他名称，则无法使用 `jenkins.service` 单元名称停止该服务。请使用正确的服务单元名称。

如果您已经确认 Jenkins 服务已正确安装并在运行，但仍然无法停止服务，请尝试使用 `kill` 命令强制结束 Jenkins 进程，然后再执行卸载操作。

Failed to start jenkins.service: Unit not found.

As an AI language model, I do not have access to your system, so I can only provide general troubleshooting steps.

Here are some possible reasons and solutions for the error message "Failed to start jenkins.service: Unit not found":

1. Jenkins is not installed: Make sure Jenkins is installed on your system. You can install it using the official installation guide for your operating system.

2. Jenkins service is not enabled: If Jenkins is installed but the service is not enabled, you can enable it using the command:

   sudo systemctl enable jenkins.service

3. Jenkins service is not running: If Jenkins is installed and the service is enabled, but it still fails to start, try starting the service manually using the command:

   sudo systemctl start jenkins.service

4. Jenkins service file is missing or corrupted: If none of the above solutions work, there might be an issue with the Jenkins service file. You can try reinstalling the Jenkins package or downloading the service file from the official Jenkins GitHub repository.

5. Jenkins is not supported on your operating system: Check the official documentation to see if Jenkins is supported on your operating system. If it is not, you might need to use a different solution or install Jenkins in a virtual machine.

I hope these solutions help you resolve the issue with starting the Jenkins service.